17 years is a very long time and, as an adult married woman, you are far from being the vulnerable young girl who was abused by a man who, from what you've said, had mental health issues
It could be that his memories of events are substantially different from your own and, were you to come face to face with him while you're out and about, he may greet you as if you are a long lost friend.
It could also be that the passing of time has altered him for the better; he may be married with dc or have a significant other and could now be harmless as far as society and you are concerned.
As it would seem that this man was not charged with any offence against your or was subject to a restraining order obtained by you, the police are not a liberty to disclose any information about him that you're not already aware of.
However, as he may be staying/living near to your home, I would suggest that you give the police a call on the non-emergency number and ask to speak to your local Community Police Officer and tell him/her what you've said here.
If they don't know already, your CPO will no doubt be interested to learn of a possible new arrival on their patch who has 'form' and you can rest assured that, if this man has continued to offend, his presence will be duly noted and passed to other divisions within your regional police authority.
With regard to your dh, only you know what his likely reaction to this man's possible move to your neighbourhood may be. Does he know what you endured at the hands of this man or is he unaware of that part of your past?
Whether or not you decide to tell your dh, you have lived with a monster in your head for far too long and I hope you will act on Cogito's advice to source a counsellor or therapist who specialises in dv. To this end, your local Women's Aid service may be able to recommend therapists - visit www.womensaid.org.uk to locate your nearest office and give them a call.
This man no longer has the power to harm you physically but, neverthless, it would be sensible to keep a mobile phone to hand at all times when you're out of your home and don't hesitate to call 999 if you have any cause whatsoever to believe that he may pose a threat to you.